package com.kgcx.price.config;

import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MqttClientConfig
{
    @Value("${kgcx.mqtt.url:tcp://120.78.159.128:1883}")
    private String hostUrl;

    @Value("${kgcx.mqtt.username:kgcx_price}")
    private String userName;

    @Value("${kgcx.mqtt.password:kgcx@123}")
    private String passWord;

    @Value("${kgcx.mqtt.cleanSession:true}")
    private Boolean cleanSession;

    @Value("${kgcx.mqtt.connectionTimeout:30}")
    private Integer connectionTimeout;

    @Value("${kgcx.mqtt.keepAliveInterval:20}")
    private Integer keepAliveInterval;

    @Value("${kgcx.mqtt.automaticReconnect:true}")
    private Boolean automaticReconnect;

    @Value("${kgcx.mqtt.topicName:mileageRecordUpload}")
    private String topicName;

    @Bean
    public MqttClient mqttClient() throws MqttException
    {
        // host为主机名，test为clientid即连接MQTT的客户端ID，一般以客户端唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
        MqttClient client = new MqttClient(hostUrl, String.valueOf(System.currentTimeMillis()), new MemoryPersistence());
        // MQTT的连接设置
        MqttConnectOptions options = new MqttConnectOptions();

        // 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接
        options.setCleanSession(cleanSession);
        // 设置连接的用户名
        options.setUserName(userName);
        // 设置连接的密码
        options.setPassword(passWord.toCharArray());
        // 设置超时时间 单位为秒
        options.setConnectionTimeout(connectionTimeout);
        // 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
        options.setKeepAliveInterval(keepAliveInterval);
        //设置自动重连
        options.setAutomaticReconnect(automaticReconnect);

        MqttTopic topic = client.getTopic(topicName);

        //setWill方法，如果项目中需要知道客户端是否掉线可以调用该方法。设置最终端口的通知消息
        options.setWill(topic, "close".getBytes(), 0, true);

        client.connect(options);

        return client;
    }
}
